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<p>Coconut shell was pyrolyzed using solar energy to produce biochar and evaluate its effects on methane production during anaerobic digestion (AD) of swine wastewater (SW). The study investigated the physicochemical properties of biochars generated at 400&#xa0;°C, 600&#xa0;°C, and 800&#xa0;°C. The biochar obtained at a high temperature (800&#xa0;°C) showed distinctive properties compared to the other biochars: the largest surface area (134 m<sup>2</sup>/g) and oxygen functional groups linked to turbostratic graphite clusters that could act as pH buffers, leading to high methane productivity. This biochar promoted the highest organic matter conversion to methane with a conversion rate of 72% and to 890 mL CH<sub>4</sub>/L SW, which is 2.4-fold higher than the control without material. In parallel, the 800&#xa0;°C biochar promoted the highest net production and consumption of volatile fatty acids (VFA), removal of chemical oxygen demand (COD) (82%), and methane yield (290 mL CH<sub>4</sub>/g COD). The theoretical techno-energetic analysis indicates that the combination of solar pyrolysis with AD showed an increase of up to 33 times in the energy produced with biochar obtained at 800&#xa0;°C, compared with anaerobic digestion without biochar, representing an alternative for the current energy demand.</p> Graphical Abstract <p></p>

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Impact of biochar from coconut shell and different temperatures of solar pyrolysis during the anaerobic digestion of swine wastewater

  • 期刊论文

  • 发表日期：

    2026年1月2日

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  • Vianey A. Burboa-Charis,
  • V. M. Maytorena,
  • M. A. Armenta,
  • R. A. Pérez–Enciso,
  • L. A. Flores-Sánchez,
  • Refugio B. García-Reyes,
  • Francisco J. Cervantes,
  • Bruce E. Rittmann,
  • Luis H. Alvarez

摘要

Coconut shell was pyrolyzed using solar energy to produce biochar and evaluate its effects on methane production during anaerobic digestion (AD) of swine wastewater (SW). The study investigated the physicochemical properties of biochars generated at 400 °C, 600 °C, and 800 °C. The biochar obtained at a high temperature (800 °C) showed distinctive properties compared to the other biochars: the largest surface area (134 m2/g) and oxygen functional groups linked to turbostratic graphite clusters that could act as pH buffers, leading to high methane productivity. This biochar promoted the highest organic matter conversion to methane with a conversion rate of 72% and to 890 mL CH4/L SW, which is 2.4-fold higher than the control without material. In parallel, the 800 °C biochar promoted the highest net production and consumption of volatile fatty acids (VFA), removal of chemical oxygen demand (COD) (82%), and methane yield (290 mL CH4/g COD). The theoretical techno-energetic analysis indicates that the combination of solar pyrolysis with AD showed an increase of up to 33 times in the energy produced with biochar obtained at 800 °C, compared with anaerobic digestion without biochar, representing an alternative for the current energy demand.

Graphical Abstract